projects / unix-history / blame
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1 | .\" Copyright (c) 1983 The Regents of the University of California. |
| 2 | .\" All rights reserved. | |
| 96af7611 | 3 | .\" |
| 91cff1e1 | 4 | .\" %sccs.include.redist.man% |
| 96af7611 | 5 | .\" |
| 5904c8d5 | 6 | .\" @(#)byteorder.3 6.6 (Berkeley) %G% |
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7 | .\" |
| 8 | .TH BYTEORDER 3 "" | |
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9 | .UC 5 |
| 10 | .SH NAME | |
| 11 | htonl, htons, ntohl, ntohs \- convert values between host and network byte order | |
| 12 | .SH SYNOPSIS | |
| 13 | .nf | |
| 5904c8d5 | 14 | .B #include <sys/param.h> |
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15 | .PP |
| 16 | .B netlong = htonl(hostlong); | |
| 17 | .B u_long netlong, hostlong; | |
| 18 | .PP | |
| 19 | .B netshort = htons(hostshort); | |
| 20 | .B u_short netshort, hostshort; | |
| 21 | .PP | |
| 22 | .B hostlong = ntohl(netlong); | |
| 23 | .B u_long hostlong, netlong; | |
| 24 | .PP | |
| 25 | .B hostshort = ntohs(netshort); | |
| 26 | .B u_short hostshort, netshort; | |
| 27 | .fi | |
| 28 | .SH DESCRIPTION | |
| 29 | These routines convert 16 and 32 bit quantities between network | |
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30 | byte order and host byte order. |
| 31 | On machines which have a byte order which is the same as the network | |
| 32 | order, routines are defined as null macros. | |
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33 | .PP |
| 34 | These routines are most often used in conjunction with Internet | |
| 35 | addresses and ports as returned by | |
| 968d6b3e | 36 | .IR gethostbyname (3) |
| 96af7611 | 37 | and |
| 968d6b3e | 38 | .IR getservent (3). |
| 96af7611 | 39 | .SH "SEE ALSO" |
| 968d6b3e | 40 | gethostbyname(3), getservent(3) |
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41 | .SH BUGS |
| 42 | The VAX handles bytes backwards from most everyone else in | |
| 43 | the world. This is not expected to be fixed in the near future. |